From my experience after it gets dark it takes a couple of hours for the fish to get their eyes aclimated to the lack of light. During this time they are picking up the vibration more than by sight, during this time I will throw a 3/4-1oz black/red flash spinner bait with a large colorado blade, or a crank bait that gives off allot of vibration. Sometimes with a rattle sometimes without let the fish dictate that.Vary your retrieves, sometimes you can barely real it fast enough as they want it burned back other times a slow steady retrieve works best. Around nignight Ill start start experamenting with plastics both big 10"-12" dark colored works. (I always insert rattles into my big baits) changing up all the way down to drop shotting 4" finish worms. You can pick up a pattern pretty quickly if they are active.If you are fishing gradually sloping banks, quietly pitch you baits up on the bank and slowly drag it back into the water . You will be suprised how shallow fish get at night just waiting for something to enter the water to eat,